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CERTIFICATE OF ANALYSIS Reference Substance

Date

Timolol impurity –B (Isotimolol) Batch No.: IUPAC Name: 3-(tert-butylamino)-2-(4-morphilino-1,2,3-thiadiazol-3-yloxy)propan-1-ol

Molecular Formula: C13H24N4O3S Molecular Weight: 316.42 Sr.# 1 2 3 4

Test Appearance Purity by HPLC MASS NMR

Results Pale Yellow Oil 99.62% Conform Conform

Data ref. -----Chromatogram attached Report attached Report attached

Storage condition: Store below 20°C in an air tight container. Protect from direct sunlight. Shipment date: This certificate of analysis is valid for two years from date of manufacturing provided the substance is stored under suitable conditions. Date of manufacturing: Retest Date: Document data reference:

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Timolol impurity  
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